Not sure if they count, but the site appears to be missing loads of British star-forts built around the great lakes, st. lawrence, and eastern Canada!

https://en.wikipedia.org/wiki/Citadel_Hill_(Fort_George)

https://en.wikipedia.org/wiki/Georges_Island_(Nova_Scotia)

https://en.wikipedia.org/wiki/Citadelle_of_Quebec

https://en.wikipedia.org/wiki/Old_Fort_Erie

https://en.wikipedia.org/wiki/Fort_Anne

They built these things _everywhere_, probably a good part of what bankrupted the British Empire!

https://en.wikipedia.org/wiki/Fort_Charlotte_(Nassau)

https://en.wikipedia.org/wiki/Prince_of_Wales_Fort

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NicuCalcea an hour ago | parent | next [-]

I imagine they only downloaded whatever was tagged as "castle" in wikidata. Compare these two:

Bran Castle: https://www.wikidata.org/wiki/Q390275

Citadel Hill: https://www.wikidata.org/wiki/Q321867

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mr_toad 3 hours ago | parent | prev [-]

It’s missing the extensive Napoleonic-era Western Fortifications on the opposite side of Dover from the much more famous Dover Castle.

https://en.wikipedia.org/wiki/Dover_Western_Heights

But to be fair they’re much less well known, and quite well concealed, and are partly on private land, with big fences, cameras and scary warning signs. Tourists don’t seem to be much interested in post-medieval fortifications.

	▲	yabones 3 hours ago \| parent [-]
		It's probably somewhat regional, as the ones in Canada seem to have pretty good tourism interest, especially when they're right inside a city like Quebec and Halifax. But we're also very starved for true "Medieval Castles" like Europe or east Asia, so we take what we can get!